The 32-year-old registered nurse took the oath of office in the House chamber on Thursday afternoon.

Underwood’s career in politics first began in 2014 as a policy professional in the Obama administration, shortly after earning two master’s degrees from Johns Hopkins University, according to The Chicago Tribune.

The Illinois Democrat became senior adviser at the U.S. Department of Health and Human Services (HHS) two years later, where she reportedly helped work to implement the Patient Protection and Affordable Care Act (ACA).

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She announced her run for Illinois's 14th congressional district in August 2017 and reportedly ran on a platform that included improving the ACA and bringing more job opportunities to her district.